Deprecate image.image and replace it with image.repository

What does this MR do?

Replaces image.image with image.repository to be on par with the standard helm chart conventions and also to allow renovate to support automated-updated of the container image version in the helm values

Enhancement of !351 (merged)

What's the best way to test this MR?

helm-unittests updated

What are the relevant issue numbers?

#140 (comment 3774054254)